Molding-machine for foundry use



J. B. NEESHAM.

Patented Sept. 28, 1920.

3 SHEETSSHEET l.

,1. B. NEESHAM.

MOLDING MACHINE FOR FOUNDRY USE.

APPLICATION FILED JUNE 24. 1919.

Patented Sept. 28, 1920.

' 3SHEETS-SHEET 2- J. B. NEESHAM. MOLDING MACHINE FOR FOUNDRY use. APPLICATION FILED JUNE 24. 1919.

1 ,854, 1 24, Patented Sept. 28, 1920.

g 3 SHEETS-SHEET 3- JOHN BIRCH NEESHAM, OF GLASGGVT, SCOTLAND.

MOLDING-MACHINE FOR FUUNDRY USE.

Specification of Letters Patent.

Patented Sept. 28, 1920.

Original application filed January 18, 1919, Serial No. 271,898. Divided and this application filed June To all whom it may concern:

Be it known that 1, JOHN BIRCH NnnsHAM,

or" 36 Cumlodden Drive, llaryhill, Glasgow, Scotland, a subject of the King of Great Britain, have invented certain new and useful. Improvements in lvioldingMachines for Foundry Use, of which the following is a specification.

This invention relates to molding machines for foundry use, of the jarring type and having a turn-over table, of the class in W11Cl1 the mold is raised by fluid pressure and is allowed'to fall by gravity the mold being formed about the pattern by jarring or jolting.

The present application is a subdivision or my co-pending application, Serial No. 271898 filed January 18, 1919.

Under this invention, the molding machine comprises a molding table and a turn over table, fluid pressure cylinders being connected with the tables, and valve means being provided for controlling the supply of fluid under pressure to the cylinders, whereby the raising and lowering of the tables and the jarring operation are performed. It further comprises means adapted to receive the jarring impact of the tables whereby the impact force is distributed evenly over the whole area thereof, said means consisting of a plurality of plungers located on the underside of the molding table and adapted to c -act with impact columns formed with cushioning seats for the same.

There is provided in connection with the valve controlling the jarring operation, a pilot valve and a by-pass, the construction and arrangement being such that the action of the jarring valve is controlled by the pilot valve so that the necessary volume of pressure fluid is admitted for jarring purposes, while the jarring valve can also be controlled or locked by the pressure fluid at the proper times, for example, when drawing a pattern and its movement prevented in the event of the supply of fluid to the pilot valve being inadvertently or accidentally turned on, which would, in ordinary circumstances, cause the molding table to precipitately fall.

On the drawings Figure 1 is a side view of the improved molding machine, showing in dotted lines, the turn-over table D in the raised position.

Fig. 1 is a detail view of one of the im- Serial No. 306,340.

pact columns showing the arrangement for cushioning and distributing the impact force of the tables during the jarring operation.

Fig. 2 is an end view of the machine and showing, in dotted lines, the turn-over table D in the raised position.

Fig. 3 is a side view, partly in section, and Fig. 4: a plan view showing the valve mechanism.

The machine illustrated comprises the main fluid pressure cylinder A and the fluid pressure side cylinders C, the former containing the ram for raising the molding table B, and the latter containing the rams for raising the turn-over table D, the jarring operation of the tables being controlled by the jarring valve F and the pilot valve G.

Under the present invention I provide, in conjunction with the table B, a plurality of impact columns B spaced at suitable dis tances apart under the table B and arranged to co-act with plungers B thereon in such manner as to receive the impact of the table to produce a jarring action, when the latter falls under gravity, and so as to distribute the force of impact evenly over the whole area thereof.

The machine illustrated has eight impact columns B grouped about the main cylinder A but the number of such columns may be varied according to requirements and t0 the size of the machine.

Each impact column B at its upper end, as shown at Fig. 1, is formed with a. recess 1 in which cushioning means is arranged such as a fiber or like block 2, resting on a bed of rubber or other elastic or yielding material 3.

The jarring operation is eifected by admitting fluid pressure to the pilot valve (Fig. 3) by means of the pipe J thereby raising the valve 7c until it contacts with the lower end of the pilot valve control rod a depending from the table B. Pressure fluid is then admitted to the valve chest I) by the pipe K (Fig. to allow of the same passing by means or" the port 6 in the wall of the chest 7; and leading to the underside of the piston in the main cylinder A thereby raising the molding table B, together with the turn-over table D (having the pattern and mold box thereon) and the control rod a thus releasing the pilot valve which, havingpressure fluid underneath it, resumes its upward movement until the lower end of the slot 70 contacts with the screw pin k when it stops. In this position the port m comes opposite the port m in the wall of the chest 6 thus admitting pressure fluid to the underside ofthe upper part of the jarring valve a and forcing said valve upward from its seat 9 against the lower end of the screw a in the cover so as to open the exhaust port 6 leading from the main cylinder A and exhaust opening 7 in the valve chest Z) and permit the pressure fluid to exhaust from the main cylinder A thereby causing the molding table B to at once fall.

the spring a immediately forces the jarring I valve a down on its seat g bringing the various parts into their original position again for repeating the arr1ng operation which op eration is continued as long as the pressure fluid is allowed to pass to the pilot valve 70 by the pipe J and to the jarring valve a by the pipe K.

Each time the table B falls the plungers B thereon enter the recesses l in the columns B and impact on the fiber blocks 2 therein. The fiber blocks 2 and rubber blocks 3 yield to a limited extent under the impact and this insures that each and every plunger is brought into contact with its fiber block inthe corresponding impact cylinder so that the impact force is evenly distributedvover the whole table and as a result the sand in the molding box is so compacted as to be of uniform density throughout.

When the jarring operation is concluded pressurefluid is admitted to the side cylinders C by the pipe I, to raise the turn-over table D, from whence it also passes by way ofthe by-pass H and opening d into the valve chest I) thereby locking the jarring valve a during the raising and reversing of the turn-over table D. The table D is reversed by means of the worm gear E operating by the hand wheel E Fluid is then admitted to the main cylinder A by the-pipe K to raise the molding table B to meet the turned over mold and, thereafter, the supply of fluid to the main-cylinder is discontinued and the usual exhaust cock, (not shown) for exhausting fluid from below the main ram is opened to allow the table and mold gradually to resume their normal position; or this may be allowed to be effected by leakage around the main ram. hen the mold is cleared off the molding table B the turn- 7 allows the turn-overtable D also to fall to its normal position. \Vhen this takes place the jarring valve (1, is relieved of the fluid pressure in the upper part of the valve chest 6 and the valve a is then again under normal working conditions.

Having now fully described my invention what I claim and desire to secure by Letters Patent is 1. A molding machine'of the jarring type and operated by fluid pressure, having a molding table, a cylinder with ram therein for raising said table, valve mechanism for controlling the fluid pressure admitted to the said cylinder whereby said table can be automatically raised and then allowed to fall, stationary impact members and means arranged in connection with said impact members to receive the impact of the table each time it falls to produce an equable jarring action throughout said table.

2. A molding machine of the jarring type and operated by. fluid pressure, having a molding table, a cylinder with ram therein for raising said table, valve mechanism for controlling the fluid pressure admitted to said cylinder whereby said table can be automatically raised and then allowed to fall, stationary impact members and a plurality of plungers on the table adapted to co-act with said impact members and produce an equable jarring action throughout the table.

3. A molding machine of the jarring type and operated by fluid pressure, having a molding table, a cylinder with ram therein for raising said table, valve mechanism for controlling the fluid pressure admitted to said cylinder whereby the tablecan be automatically raised and then allowed to fall and means arranged to receive the impact of the table each time it falls to produce the jarring action, said means comprising aplurality of stationary impact columns, a plurality of plungers on the table and cushioning means interposed between the plungers and the impact columns.

4. A molding machineof the jarring type and operable by fluid pressure, having a molding table, a cylinder with ram therein for raising said table, valve mechanism for controlling the fluid pressure admitted to said cylinder whereby the table can be automatically raised and then allowed to fall, stationary impact members having recesses therein, cushioning means in said recesses and plungers on the table adapted to co-act with said cushioning means and impact members to produce an equable jarring action throughout the table.

In testimony whereof I affix my signature in presence of two witnesses JOHN BIRCH NEESHAM.

Witnesses MARY GREEN, CATHIE LAURIE. 

